PRCC and nonpapillary renal cell carcinoma: The mean and median enhancement of ccRCC was significantly higher than that of pRCC in the arterial phase (mean enhancement, 93 HU vs 51 HU, p < 0.01; median enhancement, 91 HU vs 48 HU, p < 0.01), nephrographic phase (mean enhancement, 111 HU vs 76 HU, p < 0.01; median enhancement, 110 HU vs 72 HU, p < 0.01) and excretory phases (mean enhancement, 75 HU vs 60 HU, p < 0.01; median enhancement, 71 HU vs 57 HU, p < 0.01) (Figures 1 and 2).